package com.itheima.chapter03.characterstring;
/*
    拼接字符串
 */
public class demostringbuilder1 {
    public static void main(String[] args) {
        int[] arr ={5,7,9};
        String s =arrayToString(arr);
        System.out.println("s:"+s);
    }
    public  static String arrayToString(int[] arr){
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        for (int i = 0; i <arr.length ; i++) {
            if(i == arr.length-1){
                sb.append(arr[i]);
            }else {
                sb.append(arr[i]).append(", ");
            }
        }
        sb.append("]");
        String s = sb.toString();
        return  s;
    }
}
